The OSI-RE-SS is a reflector- style linear optical beam smoke detector meant to run being a element of fireplace alarm devices. The beam operates primarily on the principle of sunshine obscuration utilising an Infra-Crimson beam. Shut/span> You cannot accessibility this website page as this products is not accessible with your https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/